export API symbols from MIGraphX C dynamic library (#1990)

src/api/CMakeLists.txt

@@ -26,6 +26,7 @@ add_library(migraphx_c
     api.cpp
 )
 set_target_properties(migraphx_c PROPERTIES EXPORT_NAME c)
+migraphx_generate_export_header(migraphx_c DIRECTORY migraphx/api)
 
 # migraphx_c is stable API interface library. SO version of this should be 
 # bumped when binary compatibility is broken. 

src/api/api.cpp

@@ -44,7 +44,7 @@ namespace migraphx {
 
 static thread_local bool disable_exception_catch = false; // NOLINT
 
-extern "C" void migraphx_test_private_disable_exception_catch(bool b)
+extern "C" MIGRAPHX_C_EXPORT void migraphx_test_private_disable_exception_catch(bool b)
 {
     disable_exception_catch = b;
 }

test/api/test_custom_op.cpp

@@ -99,7 +99,7 @@ TEST_CASE(run_sigmoid_custom_op)
     EXPECT(bool{result == migraphx::argument(s, expected_result.data())});
 }
 
-extern "C" void migraphx_test_private_disable_exception_catch(bool b);
+extern "C" MIGRAPHX_C_EXPORT void migraphx_test_private_disable_exception_catch(bool);
 
 TEST_CASE(run_sigmoid_with_incorrect_shape)
 {

tools/api.py

@@ -36,6 +36,8 @@ error_type = ''
 success_type = ''
 try_wrap = ''
 
+export_c_macro = 'MIGRAPHX_C_EXPORT'
+
 c_header_preamble: List[str] = []
 c_api_body_preamble: List[str] = []
 cpp_header_preamble: List[str] = []
@@ -125,7 +127,7 @@ class Type:
 
 
 header_function = Template('''
-${error_type} ${name}(${params});
+${export_c_macro} ${error_type} ${name}(${params});
 ''')
 
 function_pointer_typedef = Template('''
@@ -177,7 +179,7 @@ class CFunction:
                                **kwargs)
 
     def generate_header(self) -> str:
-        return self.substitute(header_function)
+        return self.substitute(header_function, export_c_macro=export_c_macro)
 
     def generate_function_pointer(self, name: Optional[str] = None) -> str:
         return self.substitute(function_pointer_typedef,

tools/api/api.cpp

@@ -44,7 +44,7 @@ namespace migraphx {
 
 static thread_local bool disable_exception_catch = false; // NOLINT
 
-extern "C" void migraphx_test_private_disable_exception_catch(bool b)
+extern "C" MIGRAPHX_C_EXPORT void migraphx_test_private_disable_exception_catch(bool b)
 {
     disable_exception_catch = b;
 }

tools/api/migraphx.h

@@ -26,6 +26,9 @@
 
 #include <stdlib.h>
 #include <stdbool.h>
+
+#include <migraphx/api/export.h>
+
 // Add new types here
 // clang-format off
 #define MIGRAPHX_SHAPE_VISIT_TYPES(m) \